the clusters are uniquely defined as soon as \(\lambda _{\min }\left(_{  }^*\right) > 0\) , which is the minimal condition under which one can study properties of the inverse of \(_{  }^*\) . Moreover,
[1]} developed two algorithms, PECOK and COD, that are shown to recover the clusters exactly, from \(n\)  i.i.d. copies \(_1, \ldots , _n\)  of \(\) , as soon as
\( \lambda _{\min }\left(_{  }^*\right) \ge c, \) 
